IT: Chapter 2 could go a lot farther than IT in 1990 did.
Pennywise could only go so far to terrify kids on ABC, and Richie “Trashmouth” Tozier had a much less trashy mouth.
That said, the 1990 miniseries aired on network TV with a pretty small budget.
Nowadays, a lot more is possible on TV thanks to premium cable networks like HBO and Starz, with 21st century special effects and often substantial budgets.